That's kind of odd, since I have not heard any of the new Intel GPUs dying this early, or are defective/DOA. Could it be your PSU causing the crashes ?
I discarded the PSU theory because crashes happened at full idle (AFK), light load (media playback) and at least once that I remember while in game and I've had 4+ hours long gaming sessions without issues. One of the things I tried while messing around with BIOS settings was disabling CPU C-states to provide a more steady baseline load in case crashes were caused by PSU transient response and that made no difference. I also rolled back my CPU and RAM undervolts just in case extra noise from the GPU might be an issue, no dice there either.
My PC runs fine for months on end with the most aggressive CPU C-states enabled (spending ~80% of its time in C7 right now) with my GTX1050, which makes me quite confident my PSU can handle harsh ~100W transients perfectly fine all day, every day.
My PSU is a 650W SilverStone Strider Platinum which I received as a gift years ago. Not the most praised PSU brand but still far more high-end than anything I would have bought for myself and far more high-end than what most people buying an A750 are likely to have.
Since it was an open-box, my guess is whoever bought it first ran into similar issues, didn't have the patience to try to sort it out, returned it for whatever reason, store gave it a quick whirl to check that it was still working, put it back on the shelf hoping the next guy (me) would either have better luck or come back with a more detailed account of problems encountered with the card.
Maybe you haven't heard about A-series GPUs dying because there aren't that many out there in the first place. Early failure rates for consumer electronics are usually in the 1-2% range, failed A7xx should definitely be out there even if you haven't seen any yourself.